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Checkpoint Solution

The patterns in both harvests appear to be quadratic. The number of blades of grass increases as the nitrogen level increases at first, but eventually starts to decrease. This means that initially more nitrogen is good for growing grass, but there is a point where it doesn't help anymore. After that point, increased nitrogen hurts grass growth.

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In Example 3, the problem facing Earth seems clear. The amount of carbon dioxide in Earth's atmosphere is increasing. Like so many problems facing Earth, this can be tied directly to overpopulation of the planet.